In a truly original interactive experience, young players join Cookie Monster, Elmo and other Sesame Street characters as they explore a living storybook titled Once Upon a Monster. In the book, they make new zany monster friends from the Once Upon a Monster world and share in their adventures, solving problems, forging friendships and learning key life skills along the way. Parents and children literally become part of the whimsical storybook adventure by getting active together through dancing, jumping, flying and more.